rpm backup

[Howard Coleman]

i recently noticed rpm backup/regression during a period of increasing throttle input. all other metrics seem O K. 

i normally associate this as misfires. if you input zero smoothing on a dyno chart it appears as very fine jogs. misfires often accur from too large a plug gap or not enough voltage at the plug. if you change from zero smoothing to smoothing they often disappear.

i think my ignition system is pretty solid. i have four IGN-1A coils, Magnecor wires, Denso iridium 10.5 plugs gapped about .024. the coils receive 16 V under boost from a Kenne Bell Boost A Spark.

looking back at my earlier data with the same ignition and my V88 i find no rpm backup however my rpm data is approx 5 cps.

my Link G4X Extreme is currently generating data at approx 25/28 cps.

could the significantly larger sample rate be the issue?

here's a typical rpm sequence from today:

6735, 6747, 6776, 6844, 6854, 6807, 6861, 6835, 6829, 6991, 6898, 6858, 6926, 6939

TPS started at 52.7 and ended at 99.8 all tps numbers were sequentially higher.

26 samples per second.

run was done on a road. could road irregularities cause this or?

 

 

 

[Adamw]

I have no idea what you are on about.  You might have to explain better or give an example.